// ===================================================================
// Author: Matt Kruse <matt@mattkruse.com>
// WWW: http://www.mattkruse.com/
// ===================================================================

function selectUnselectMatchingOptions(obj,regex,which,only) {
  if (window.RegExp) {
    if (which == "select") {
      var selected1=true;
      var selected2=false;
    }
    else if (which == "unselect") {
      var selected1=false;
      var selected2=true;
    }
    else {
      return;
    }
    var re = new RegExp(regex);
    for (var i=0; i<obj.options.length; i++) {
      if (re.test(obj.options[i].text)) {
        obj.options[i].selected = selected1;
      }
      else {
        if (only == true) {
          obj.options[i].selected = selected2;
        }
      }
    }
  }
}
    
function selectMatchingOptions(obj,regex) {
  selectUnselectMatchingOptions(obj,regex,"select",false);
}
function selectOnlyMatchingOptions(obj,regex) {
  selectUnselectMatchingOptions(obj,regex,"select",true);
}
function unSelectMatchingOptions(obj,regex) {
  selectUnselectMatchingOptions(obj,regex,"unselect",false);
}
  
function sortSelect(obj) {
  var o = new Array();
  for (var i=0; i<obj.options.length; i++) {
    o[o.length] = new Option( obj.options[i].text, obj.options[i].value, obj.options[i].defaultSelected, obj.options[i].selected) ;
  }
  o = o.sort( 
    function(a,b) { 
      if ((a.text+"") < (b.text+"")) { return -1; }
      if ((a.text+"") > (b.text+"")) { return 1; }
      return 0;
    } 
  );

  for (var i=0; i<o.length; i++) {
    obj.options[i] = new Option(o[i].text, o[i].value, o[i].defaultSelected, o[i].selected);
  }
}

function selAllOpt(obj) {
  for (var i=0; i<obj.options.length; i++) {
    obj.options[i].selected = true;
  }
}
  
function mvSelOpt(from,to) {
  // Unselect matching options, if required
  if (arguments.length>3) {
    var regex = arguments[3];
    if (regex != "") {
      unSelectMatchingOptions(from,regex);
    }
  }
  // Move them over
  for (var i=0; i<from.options.length; i++) {
    var o = from.options[i];
    if (o.selected) {
      to.options[to.options.length] = new Option( o.text, o.value, false, false);
    }
  }
  // Delete them from original
  for (var i=(from.options.length-1); i>=0; i--) {
    var o = from.options[i];
    if (o.selected) {
      from.options[i] = null;
    }
  }
  if ((arguments.length<3) || (arguments[2]==true)) {
    sortSelect(from);
    sortSelect(to);
  }
  from.selectedIndex = -1;
  to.selectedIndex = -1;
}

function cpSelOpt(from,to) {
  var options = new Object();
  for (var i=0; i<to.options.length; i++) {
    options[to.options[i].text] = true;
  }
  for (var i=0; i<from.options.length; i++) {
    var o = from.options[i];
    if (o.selected) {
      if (options[o.text] == null || options[o.text] == "undefined") {
        to.options[to.options.length] = new Option( o.text, o.value, false, false);
      }
    }
  }
  if ((arguments.length<3) || (arguments[2]==true)) {
    sortSelect(to);
  }
  from.selectedIndex = -1;
  to.selectedIndex = -1;
}

function mvAllOpt(from,to) {
  selAllOpt(from);
  if (arguments.length==2) {
    mvSelOpt(from,to);
  }
  else if (arguments.length==3) {
    mvSelOpt(from,to,arguments[2]);
  }
  else if (arguments.length==4) {
    mvSelOpt(from,to,arguments[2],arguments[3]);
  }
}

function cpAllOpt(from,to) {
  selAllOpt(from);
  if (arguments.length==2) {
    cpSelOpt(from,to);
  }
  else if (arguments.length==3) {
    cpSelOpt(from,to,arguments[2]);
  }
}

function swapOptions(obj,i,j) {
  var o = obj.options;
  var i_selected = o[i].selected;
  var j_selected = o[j].selected;
  var temp = new Option(o[i].text, o[i].value, o[i].defaultSelected, o[i].selected);
  var temp2= new Option(o[j].text, o[j].value, o[j].defaultSelected, o[j].selected);
  o[i] = temp2;
  o[j] = temp;
  o[i].selected = j_selected;
  o[j].selected = i_selected;
}
  
function mvOptUp(obj) {
  // If > 1 option selected, do nothing
  var selectedCount=0;
  for (i=0; i<obj.options.length; i++) {
    if (obj.options[i].selected) {
      selectedCount++;
    }
  }
  if (selectedCount > 1) {
    return;
  }
  // If this is the first item in the list, do nothing
  var i = obj.selectedIndex;
  if (i == 0) {
    return;
  }
  swapOptions(obj,i,i-1);
  obj.options[i-1].selected = true;
}

function mvOptDown(obj) {
  // If > 1 option selected, do nothing
  var selectedCount=0;
  for (i=0; i<obj.options.length; i++) {
    if (obj.options[i].selected) {
      selectedCount++;
    }
  }
  if (selectedCount > 1) {
    return;
  }
  // If this is the last item in the list, do nothing
  var i = obj.selectedIndex;
  if (i == (obj.options.length-1)) {
    return;
  }
  swapOptions(obj,i,i+1);
  obj.options[i+1].selected = true;
}

function rmSelOpt(from) { 
  for (var i=(from.options.length-1); i>=0; i--) { 
    var o=from.options[i]; 
    if (o.selected) { 
      from.options[i] = null; 
    } 
  } 
  from.selectedIndex = -1; 
} 

function rmAllOpt(from) { 
  for (var i=(from.options.length-1); i>=0; i--) { 
    from.options[i] = null; 
  } 
  from.selectedIndex = -1; 
} 

function addOpt(obj,text,value,selected) {
  if (obj!=null && obj.options!=null) {
    obj.options[obj.options.length] = new Option(text, value, false, selected);
  }
}